updraft
Học thuậtThân thiện
Definition
Noun: A localized, upward-moving current of air. An updraft is a meteorological phenomenon where air rises vertically, often due to convective heating or when wind encounters a topographic barrier like a mountain.
Usage
The word "updraft" is used to describe the upward movement of air in various contexts, primarily in meteorology, aviation, and activities like gliding or soaring.
Examples
- The glider pilot searched for a thermal updraft to gain altitude.
- The formation of a cumulonimbus cloud is fueled by a powerful updraft.
- Hawks often circle within an updraft along the cliff face, allowing them to soar without flapping their wings.
Advanced Usage
- "Updraft" in severe weather: In supercell thunderstorms, a rotating updraft (a mesocyclone) is a key feature that can lead to tornado formation.
- "Updraft" vs. "Downdraft": These are contrasting terms. An updraft refers to rising air, while a "downdraft" refers to a column of sinking air.
Variants and Related Words
- Updraft is a closed compound noun. It is typically written as one word.
- Updraught (noun): This is a chiefly British English spelling variant of "updraft."
- Thermal (noun): A type of updraft caused by localized heating of the Earth's surface.
- Upcurrent (noun): A less common synonym for updraft.
Synonyms
- Upcurrent
- Rising air column
- Upward current
Antonyms
- Downdraft
- Downdraught
- Sinking air
Related Phrases and Concepts
- Updraft velocity: The speed at which the air is rising.
- To catch an updraft: A phrase used in aviation and by birds meaning to enter and use an upward air current to climb.
- Orographic updraft: An updraft created when horizontal wind is forced upward by a mountain slope or other terrain feature.
Noun
- a strong upward air current